1 ; RUN: opt -print-memderefs -analyze -S <%s | FileCheck %s
3 ; Uses the print-deref (+ analyze to print) pass to run
4 ; isDereferenceablePointer() on many load instruction operands
6 target datalayout = "e"
8 declare zeroext i1 @return_i1()
10 @globalstr = global [6 x i8] c"hello\00"
11 @globali32ptr = external global i32*
13 %struct.A = type { [8 x i8], [5 x i8] }
14 @globalstruct = external global %struct.A
16 @globalptr.align1 = external global i8, align 1
17 @globalptr.align16 = external global i8, align 16
19 define void @test(i32 addrspace(1)* dereferenceable(8) %dparam,
20 i8 addrspace(1)* dereferenceable(32) align 1 %dparam.align1,
21 i8 addrspace(1)* dereferenceable(32) align 16 %dparam.align16)
22 gc "statepoint-example" {
23 ; CHECK: The following are dereferenceable:
25 ; CHECK: %globalptr{{.*}}(aligned)
26 %globalptr = getelementptr inbounds [6 x i8], [6 x i8]* @globalstr, i32 0, i32 0
27 %load1 = load i8, i8* %globalptr
29 ; CHECK: %alloca{{.*}}(aligned)
31 %load2 = load i1, i1* %alloca
33 ; CHECK: %dparam{{.*}}(aligned)
34 %load3 = load i32, i32 addrspace(1)* %dparam
36 ; CHECK: %relocate{{.*}}(aligned)
37 %tok = tail call i32 (i64, i32, i1 ()*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_i1f(i64 0, i32 0, i1 ()* @return_i1, i32 0, i32 0, i32 0, i32 0, i32 addrspace(1)* %dparam)
38 %relocate = call i32 addrspace(1)* @llvm.experimental.gc.relocate.p1i32(i32 %tok, i32 7, i32 7)
39 %load4 = load i32, i32 addrspace(1)* %relocate
42 %nparam = getelementptr i32, i32 addrspace(1)* %dparam, i32 5
43 %load5 = load i32, i32 addrspace(1)* %nparam
45 ; Load from a non-dereferenceable load
47 %nd_load = load i32*, i32** @globali32ptr
48 %load6 = load i32, i32* %nd_load
50 ; Load from a dereferenceable load
51 ; CHECK: %d4_load{{.*}}(aligned)
52 %d4_load = load i32*, i32** @globali32ptr, !dereferenceable !0
53 %load7 = load i32, i32* %d4_load
55 ; Load from an offset not covered by the dereferenceable portion
57 %d2_load = load i32*, i32** @globali32ptr, !dereferenceable !1
58 %load8 = load i32, i32* %d2_load
60 ; Load from a potentially null pointer with dereferenceable_or_null
61 ; CHECK-NOT: %d_or_null_load
62 %d_or_null_load = load i32*, i32** @globali32ptr, !dereferenceable_or_null !0
63 %load9 = load i32, i32* %d_or_null_load
65 ; Load from a non-null pointer with dereferenceable_or_null
66 ; CHECK: %d_or_null_non_null_load{{.*}}(aligned)
67 %d_or_null_non_null_load = load i32*, i32** @globali32ptr, !nonnull !2, !dereferenceable_or_null !0
68 %load10 = load i32, i32* %d_or_null_non_null_load
70 ; It's OK to overrun static array size as long as we stay within underlying object size
71 ; CHECK: %within_allocation{{.*}}(aligned)
72 %within_allocation = getelementptr inbounds %struct.A, %struct.A* @globalstruct, i64 0, i32 0, i64 10
73 %load11 = load i8, i8* %within_allocation
75 ; GEP is outside the underlying object size
76 ; CHECK-NOT: %outside_allocation
77 %outside_allocation = getelementptr inbounds %struct.A, %struct.A* @globalstruct, i64 0, i32 1, i64 10
78 %load12 = load i8, i8* %outside_allocation
80 ; Loads from aligned globals
81 ; CHECK: @globalptr.align1{{.*}}(unaligned)
82 ; CHECK: @globalptr.align16{{.*}}(aligned)
83 %load13 = load i8, i8* @globalptr.align1, align 16
84 %load14 = load i8, i8* @globalptr.align16, align 16
86 ; Loads from aligned arguments
87 ; CHECK: %dparam.align1{{.*}}(unaligned)
88 ; CHECK: %dparam.align16{{.*}}(aligned)
89 %load15 = load i8, i8 addrspace(1)* %dparam.align1, align 16
90 %load16 = load i8, i8 addrspace(1)* %dparam.align16, align 16
92 ; Loads from aligned allocas
93 ; CHECK: %alloca.align1{{.*}}(unaligned)
94 ; CHECK: %alloca.align16{{.*}}(aligned)
95 %alloca.align1 = alloca i1, align 1
96 %alloca.align16 = alloca i1, align 16
97 %load17 = load i1, i1* %alloca.align1, align 16
98 %load18 = load i1, i1* %alloca.align16, align 16
101 ; CHECK: %gep.align1.offset1{{.*}}(unaligned)
102 ; CHECK: %gep.align16.offset1{{.*}}(unaligned)
103 ; CHECK: %gep.align1.offset16{{.*}}(unaligned)
104 ; CHECK: %gep.align16.offset16{{.*}}(aligned)
105 %gep.align1.offset1 = getelementptr inbounds i8, i8 addrspace(1)* %dparam.align1, i32 1
106 %gep.align16.offset1 = getelementptr inbounds i8, i8 addrspace(1)* %dparam.align16, i32 1
107 %gep.align1.offset16 = getelementptr inbounds i8, i8 addrspace(1)* %dparam.align1, i32 16
108 %gep.align16.offset16 = getelementptr inbounds i8, i8 addrspace(1)* %dparam.align16, i32 16
109 %load19 = load i8, i8 addrspace(1)* %gep.align1.offset1, align 16
110 %load20 = load i8, i8 addrspace(1)* %gep.align16.offset1, align 16
111 %load21 = load i8, i8 addrspace(1)* %gep.align1.offset16, align 16
112 %load22 = load i8, i8 addrspace(1)* %gep.align16.offset16, align 16
117 declare i32 @llvm.experimental.gc.statepoint.p0f_i1f(i64, i32, i1 ()*, i32, i32, ...)
118 declare i32 addrspace(1)* @llvm.experimental.gc.relocate.p1i32(i32, i32, i32)